Anisotropic-strain-induced antiferromagnetic-insulating state with strong phase instability in epitaxial (La(0.8)Pr(0.2))(0.67)Ca(0.33)MnO(3) films

作者：Zhang F H^*; Huang Z; Gao G Y; Chen P F; Wang L F; Tan X L; Wu W B

来源：Applied Physics Letters, 2010, 96(6): 062507.

DOI：10.1063/1.3313937

• antiferromagnetic materials
• calcium compounds
• ferromagnetic materials
• galvanomagnetic effects
• induced anisotropy (magnetic)
• insulating materials
• internal stresses
• lanthanum compounds
• magnetic thin films
• magnetic transitions
• praseodymium compounds

We grow epitaxial (La(0.8)Pr(0.2))(0.67)Ca(0.33)MnO(3) films simultaneously on the lattice-closely-matched substrates, cubic (LaAlO(3))(0.3)(Sr(2)AlTaO(6))(0.7) [LSAT(001)] and orthorhombic NdGaO(3) [NGO(001) and NGO(110)]. While all as-grown films show a ferromagnetic-metallic (FM) ground state as observed for the bulk target, the annealed films show quite different magnetotransport behavior as follows: on NGO(110) they show a robust FM ground state, on LSAT(001) and NGO(001) however, they show surprisingly a coexisted antiferromagnetic insulating state with high phase instability in a wide temperature range. The phase coexistence being easily induced via the control of anisotropic epitaxial strain suggests that the phase separation in manganites could be elastically driven, and thus can be strain-engineered for devices applications.

• 出版日期2010-2-8
• 单位中国科学技术大学